Dear Sir/Madam, we are Geremias Technologies, from India. We are newcomers in freelancer website, so there is no many reviews available about us. However, we are not new to App making graphic designing and coding. We have 6 year experience Java, Javascript, iOS, Android, HTML, and PHP. We can handle Cocos2d-x. We have read the main points of your requirements. Therefore, please contact us and discuss the project in detail (we can arrange you a Sk-ype chat, if you need to assess us). We assure you that you will get both iPhone and Android phone compatible app design.